Energetic neutral atom image of a storm-time ring current
Energetic neutral atom image of a storm-time ring current
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DOI：
10.1029/gl014i006p00652
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发表时间：
1987-06
影响因子：
5.2
通讯作者：
E. Roelof
中科院分区：
文献类型：
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作者：
E. Roelof
根据1978年9月29日地磁暴主相(∼=−241nT)径向距离为2.6Re的ISEE1测量数据，构造并分析了一幅由电荷与环流高能离子(50keV)交换发射的高能中性原子在5分钟内形成的图像。与由全球环流离子分布的简单模型计算的模拟图像相比较，表明存在很强的(≳20：1)午夜/中午离子强度不对称性。估算的子午线(3.0kv；r<；5.0Re)离子通量，对于30keV的H+(如果H原子占主导地位)，离子通量为2.5×10 6(Cm2 S Srkev)−1；对于70keV的O+(如果O原子占主导地位)，估计的离子通量为1.0×10 6(Cm2 S Srkev)−1。来自图像最亮区域的ENA通量(无论是H还是O)超过10？(cm？S，锶kev)−1。
An image formed in 5 minutes by energetic neutal atoms (ENA) emitted by charge exchange with ring-current energetic ions (∼ 50 keV) has been constructed and analyzed from ISEE 1 measurements at a radial distance of 2.6 Re during the main phase (Dst = −241 nT) of the geomagnetic storm of September 29, 1978. Comparison with simulated images calculated from a simple model of the global ring-current ion distribution implies a strong (≳ 20:1) midnight/noon ion intensity asymmetry. Estimated ion fluxes in the midnight meridian (3.0 < r < 5.0 Re) are 2.5 × 106 (cm² s sr keV) −1 for 30 keV H+ (if H-atoms dominated the ISEE 1 ENA fluxes) or 1.0 × 106 (cm² s sr keV)−1 for 70 keV O+ (if O-atoms dominated). ENA fluxes (whether H or O) from the brightest areas of the image exceed 10³ (cm² s sr keV)−1.